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Pithonella

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Journal Article
Published: 01 November 2013
Journal of Paleontology (2013) 87 (6): 1077-1106.
..., providing new insight to this enigmatic group of microfossils. Using combined transmitted-reflected light microscopy, scanning electron microscope imagery, electron microprobe elemental analysis and stable isotope geochemistry, the present study reveals four new aspects of the genus Pithonella , notably...
FIGURES | View All (18)
Journal Article
Published: 01 January 1976
Micropaleontology (1976) 22 (1): 83-91.
Journal Article
Published: 01 July 1972
Micropaleontology (1972) 18 (3): 278-284.
Journal Article
Published: 01 November 2004
Journal of Micropalaeontology (2004) 23 (2): 139-152.
... of dinoflagellates represent the ‘benthic cyst stage’ of unicellular organisms belonging to the marine phytoplankton. The occurrence of Bolboforma, Bachmayerella is documented here and, for the first time, some calcareous cysts of dinoflagellates tentatively attributed to Alasphaera and Pithonella from Badenian...
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Image
Opercula of  <b>Pithonella</b>  from Tanzania Drilling Program Sites 22 and 31.  1...
Published: 01 November 2013
Figure 3 Opercula of Pithonella from Tanzania Drilling Program Sites 22 and 31. 1a–c, Pithonella sphaerica in slightly oblique apical view: 1a , combined reflected and transmitted light, operculum is visible as a bright subangular (pentagonal or hexagonal) area, a nook to the upper left
Image
Antapical pole.  1a, <b>Pithonella</b> ovalis , scale=10 μm, slit-shaped antapical...
Published: 01 November 2013
Figure 5 Antapical pole. 1a, Pithonella ovalis , scale=10 μm, slit-shaped antapical pore within an otherwise pore free area, outer wall largely preserved; note that most slit-pores appear closed by a thin cover; 1b , detail of antapical pore, scale=2 μm; 2, Pithonella ovalis , antapical wall
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Wall architecture, inner wall.  1a–c, <b>Pithonella</b> sphaerica , scale=20 μm:  ...
Published: 01 November 2013
Figure 6 Wall architecture, inner wall. 1a–c, Pithonella sphaerica , scale=20 μm: 1a , transmitted light, dark line marks operculum suture, bright spot is the apical pore; 1b, longitudinal cross-section in polarized light showing skewed axis cross indicative of radial-inclined (pithonellid
Image
Wall architecture, outer wall.  1, <b>Pithonella</b> ovalis , longitudinal cross-s...
Published: 01 November 2013
Figure 7 Wall architecture, outer wall. 1, Pithonella ovalis , longitudinal cross-section of antapical part showing both homogenous, crypto-crystalline wall appearance, and laminated multi-layered structure revealed upon initial recrystallization; 2, Pithonella sphaerica, apical pore wall
Image
Pores.  1, <b>Pithonella</b> ovalis , pore system on the inner cyst surface, pores...
Published: 01 November 2013
Figure 8 Pores. 1, Pithonella ovalis , pore system on the inner cyst surface, pores are wider than on the outer surface, scale=5 μm; 2, Pithonella ovalis , slit pores on outer cyst surface are thinly covered at best preservation, scale=5 μm; 3–5, details of slit-pores in outer wall
Image
Diagenetic dissolution structures.  1–7 ,  <b>Pithonella</b> ovalis :  1,  cyst su...
Published: 01 November 2013
Figure 11 Diagenetic dissolution structures. 1–7 , Pithonella ovalis : 1, cyst surface showing well-preserved outer wall and partial surface etching; 2, well-preserved inner wall surface revealing distinctive slit-pore pattern; 3, well-preserved outer wall with spots of initial
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Influence of overgrowth on primary traits in  <b>Pithonella</b> ovalis  (except  3...
Published: 01 November 2013
Figure 13 Influence of overgrowth on primary traits in Pithonella ovalis (except 3 showing Pithonella sphaerica ). 1, 2, shingle-like pattern of the outer wall enhanced by initial recrystallization, antapical pole ( 1 ) and apical pole ( 2 ), scale=5 μm; 3, strong overgrowth only
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Carbonate geochemistry of  <b>Pithonella</b>. A,  cross-plot δ 13 C versus δ 18 O ...
Published: 01 November 2013
Figure 14 Carbonate geochemistry of Pithonella. A, cross-plot δ 13 C versus δ 18 O for the early Turonian of TDP Site 31 showing a measurement obtained from large Pithonella sphaerica in relation to isotope value ranges for co-occurring benthic and planktonic foraminifera and bulk carbonate
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Neotype  <b>Pithonella</b> ovalis  specimen TDP22-31-1P_E5 sample # TDP22-31-1 (34...
Published: 01 November 2013
Figure 17 Neotype Pithonella ovalis specimen TDP22-31-1P_E5 sample # TDP22-31-1 (34–45 cm), scale=10 μm: 1a , equatorial view; 1b , apical view showing the operculum; 1c , antapical view with zoom of antapical pore.
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Additional  <b>Pithonella</b>  species present in the Turonian sediments from Tanz...
Published: 01 November 2013
Figure 18 Additional Pithonella species present in the Turonian sediments from Tanzania. 1 , Pithonella perlonga , note slit pore rows and outer wall morphology similar to Pithonella ovalis ; 2, Pithonella trejoi , etched specimen showing distal surface of inner wall and rows of pores
Journal Article
Journal: Palynology
Published: 01 March 2016
Palynology (2016) 40 (1): 137-143.
... asteriforme; Nyktericysta granorugosa, Nyktericysta pentaradiata; Palaecysta complicata, Palaecysta palmula, Palaecysta silyba ; and Pithonella melloi . Fensome et al. 1993 Genus Alterbidinium Lentin & Williams 1985 ?expirata ( Davey 1982 ) comb. nov. Egmontodinium expiratum...
Series: SEPM Special Publication
Published: 01 January 2003
DOI: 10.2110/pec.03.75.0229
EISBN: 9781565762121
... stratified water masses during deposition of marls and mixed high-productivity water masses during deposition of chalks. Sea-level changes are indicated by (1) the foraminiferal number, (2) the total abundance of planktic foraminifers, and (3) by the abundance of Pithonella ovalis , which all increase...
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Journal Article
Published: 01 April 1955
Micropaleontology (1955) 1 (2): 109-123.
...Guillermo Colom Abstract "In general, during the Jurassic (Tithonian) and lower Cretaceous, radiolarians and globigerines predominated in the zones of subsidence, while Nannoconus and tintinnids were most abundant in the sediments of the deeper zones. Pithonella and Globotruncana predominate...
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Opercula characteristics and appearance in various preservation stages, com...
Published: 01 November 2013
Figure 4 Opercula characteristics and appearance in various preservation stages, comparison with other species. 1, Pithonella sphaerica , apical view showing the operculum and central apical pore on the inner wall surface; the operculum suture is marked by a line of dissolution and cracks
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Summary of principle elements of operculum and cyst surface architecture.  ...
Published: 01 November 2013
axes pores form longitudinal rows; 2, apical view of Pithonella ovalis showing surface elements in SEM-imaging, operculum is evident as a sharply bounded disc in the pristine outer wall (broken off along the suture line and partly missing on the right-hand side); 3, Pithonella ovalis, penta
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Photomicrographs showing similarities between host sediment and burrow infi...
in > PALAIOS
Published: 24 July 2018
Fig. 4.— Photomicrographs showing similarities between host sediment and burrow infills. A ) Bioclastic packstone with abundant calcispheres ( Pithonella ovalis ), foraminifera, and fragmented bivalve fragments within L. mantelli burrow fill. B ) Similar microfacies from the surrounding